多元物質科学研究所
岡本研究室
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Publication

論文（Original Paper）

2024

    1. Width-mode order dependent spin wave conversion in an in-plane magnetized microscale T-shaped YIG magnonic splitter. [Journal of Applied Physics, 135, 233901, 2024] T. Taniguchi, J. Sahliger, F. Vilsmeier, C. H. Back (DOI: https://doi.org/10.1063/5.0218351)
    2. Multimodal iron loss analyses based on magnetization processes for various soft magnetic toroidal cores. [Journal of Magnetism and Magnetic Materials, 603, 172222, 1-6, 2024] N. Ono, Y. Uehara, T. Onuma, T. Taniguchi, N. Kikuchi, S. Okamoto (DOI:  https://doi.org/10.1016/j.jmmm.2024.172222)
    3. Direct observation of current-induced nonlinear spin torque in Pt-Py bilayers. [American Physical Society, 109, 214419, 1-7, 2024] T. Kodama, N. Kikuchi, T. Chiba, S. Okamoto, S. Ohno, S. Tomita (DOI: https://doi.org/10.1103/PhysRevB.109.214419)
    4. Fabrication and characterization of delay lines with spoof surface plasmon polariton waveguide coupled with C-shaped metamaterials for microwave integrated circuits. [Japanese Journal of Applied Physics, 63, 03SP72, 1-8, 2024] M. V. Nguyen, N. Kikuchi, T. Kodama, T. Okatani, N. Inomata, Y. Kanamori (DOI: https://doi.org/10.35848/1347-4065/ad2917)
    5. Fe-based amorphous powder cores with low core loss and improvement of permeability. [AIP Advances, 14(2), 025113, 1-6, 2024] M. P. Nguyen, S. Yoshida, S. Okamoto, T. Miyazaki, Y. Endo (DOI: https://doi.org/10.1063/9.0000771)
    6. Soft magnetic properties of Fe-Ni powder cores in the high frequency range. [AIP Advances, 14(1), 015034, 1-5, 2024] M. P. Nguyen, S. Yoshida, S. Okamoto, S. Muroga, T. Miyazaki, Y. Endo (DOI: https://doi.org/10.1063/9.0000719)
    7. Analysis on bimodal complex permeability spectrum of a noise suppression sheet and single constituent flakes. [Journal of Magnetism and Magnetic Materials, 590, 171640, 1-7, 2024] T. Igarashi, S. Tamaru, N. Kikuchi, S. Yoshida, S. Okamoto (DOI: https://doi.org/10.1016/j.jmmm.2023.171640)
2023
    1. 共振法による圧粉材料の高周波損失測定. [電気学会論文誌Ａ(基礎・材料・共通部門誌), 143(12), 374-378, 2023] 上原裕二, 河野健二, 佐藤佑樹, 岡本聡
    2. Analysis on Iron Loss of Sendust Dust Cores Based on Magnetization Reversal Processes. [IEEE TRANSACTIONS ON MAGNETICS, 59(11), 6301305, 1-5, 2023] N. Ono, Y. Uehara, Y. Endo, S. Yoshida, N. Kikuchi, H. Oikawa, S. Okamoto (DOI: https://doi.org/10.1109/tmag.2023.3287892)
    3. Accuracy Investigation of High-Frequency Core-Loss Measurement for Low-Permeability Magnetic Materials. [IEEE TRANSACTIONS ON MAGNETICS, 59(11), 6301105, 1-5, 2023] Y. Sato, Y. Uehara, S. Okamoto, S. Yoshida, Y. Endo, N. Ono, N. Misono, H. Matsumoto (DOI: https://doi.org/10.1109/tmag.2023.3283955)
    4. Feature Analysis on B–H Curves of Dust Cores Under the Application of DC Bias Field. [IEEE TRANSACTIONS ON MAGNETICS, 59(11), 6000705, 1-5, 2023] T. Onuma, Z. Li, S. Okamoto (DOI: https://doi.org/10.1109/tmag.2023.3281548)
    5. 高特性永久磁石内部の磁気ヒステリシス曲線に沿った磁区変化挙動. [電気製鋼, 94, 3-13, 2023] 宇根康裕, 竹内誠, 鈴木基寛, 小林慎太郎, 小谷佳範, 中村哲也, 菊池伸明, A. BOLYACHKIN, H. SEPEHRI-AMIN, 大久保忠勝, 宝野和博, 岡本聡
    6. Effect of film thickness on microwave assisted switching behavior. [2023 IEEE International Magnetic Conference – Short Papers (INTERMAG Short Papers), 2023] N. Kikuchi, K. Sato, M. Hatayama, T. Shimatsu, S. Okamoto (DOI: https://doi.org/10.1109/intermagshortpapers58606.2023.10228446)
    7. Understanding the Coercivity of Ga-Containing Nd-Fe-B Sintered Magnets from Feature Extraction and Selection of X-Ray Diffraction Patterns via Dimension Reduction and Sparse Modeling. [2023 IEEE International Magnetic Conference (INTERMAG), 2023] K. Ishigami, T. Onuma, A. Kato, M. Yano, T. Shoji, T. Nakamura, S. Okamoto (DOI: https://doi.org/10.1109/intermag50591.2023.10265093)
    8. 永久磁石における磁気ヒステリシスに関わる最近の進展. [日本金属学会誌, 87(5), 150-157, 2023] 岡本聡
    9. Caustic spin wave beams in soft thin films: Properties and classification. [PHYSICAL REVIEW B, 107, 144431, 1-15, 2023] A. Wartelle, F. Vilsmeier, T. Taniguchi, C. H. Back (DOI: https://doi.org/10.1103/PhysRevB.107.144431)
    10. Spin-Current-Driven Permeability Variation for Time-Varying Magnetic Metamaterials. [Physical Review Applied, 19(4), 2023] T. Kodama, N. Kikuchi, S. Okamoto, S. Ohno, S. Tomita (DOI: https://doi.org/10.1103/physrevapplied.19.044080)
    11. Microwave-assisted switching in granular media with continuous magnetic overlayers for interaction control. [Japanese Journal of Applied Physics, 62, SB1015, 1-6, 2023] N. Kikuchi, K. Sato, T. Shimatsu, S. Okamoto (DOI: https://doi.org/10.35848/1347-4065/ac9910)
    12. Thermal activation on microwave-assisted magnetization switching in Co/Pt nanodot arrays. [Japanese Journal of Applied Physics, 62, SB1012, 1-5, 2023] S. Mizutani, N. Kikuchi, M. Hatayama, T. Shimatsu, S. Okamoto (DOI: https://doi.org/10.35848/1347-4065/ac9533)
    13. Co-planar waveguide ferromagnetic resonance spectroscopy of cobalt/platinum superlattice metamaterials. [Japanese Journal of Applied Physics, 62, SB1010, 1-5, 2023] S. Tomita, N. Kikuchi, S. Okamoto (DOI: https://doi.org/10.35848/1347-4065/ac931a)
    14. Crystallographic and Magnetic Domains in Heat-Treated Fe–N Alloy Containing α″-Fe16N2 Phase. [Shape Memory and Superelasticity, Published online: 08 February 2023] T. Tamaoka1, S. Okamoto, Y. Murakami (DOI: https://doi.org/10.1007/s40830-023-00417-1)
2022
    1. Real picture of magnetic domain dynamics along the magnetic hysteresis curve inside an advanced permanent magnet. [NPG Asia Materials, 14(1), 2022] M. Takeuchi, M. Suzuki, S. Kobayashi, Y. Kotani, T. Nakamura, N. Kikuchi, A. Bolyachkin, H. Sepehri-Amin, T. Ohkubo, K. Hono, Y. Une, S. Okamoto (DOI: https://doi.org/10.1038/s41427-022-00417-0)
    2. Spintronic Materials and Their Properties Investigated by Synchrotron Radiation. [Vacuum and Surface Science, 65(5) 218-223, 2022] T. Ono, S. Okamoto, D. Chiba, M. Mizuguchi, K. Mibu (DOI: https://doi.org/10.1380/vss.65.218)
    3. Thermal activation in microwave-assisted magnetization switching and its effect on the switching behavior of granular media. [Physical Review B (APS), 105(5), 054430, 2022] N. Kikuchi, K. Sato, S. Okamoto, O. Kitakami, T. Shimatsu, H. Suto  (DOI: https://doi.org/10.1103/PhysRevB.105.054430)
    4. Temperature dependence of site-resolved Fe magnetic moments in ThMn12-type Sm(Fe1−Co )12 compounds studied via synchrotron Mössbauer spectroscopy. [Journal of Magnetism and Magnetic Materials, 552, 169188, 2022] D. Ogawa, T. Fukazawa, S. Li, T. Ueno, S. Sakai, T. Mitsui, T. Miyake, S. Okamoto, S. Hirosawa, Y.K. Takahashi  (DOI: https://doi.org/10.1016/j.jmmm.2022.169188)
    5. 軟X線磁気円二色性顕微分光によるNd-Fe-B熱間加工磁石の初磁化過程および減磁過程における磁区観察. [日本金属学会誌, 86(1), 1-7, 2022] 竹内誠, 蓬田貴裕, 菊池伸明, 豊木研太郎, 小林慎太郎, 小谷佳範, 中村哲也, 日置敬子, 岡本 聡  (DOI: https://doi.org/10.2320/jinstmet.J2021041)
2021
    1. 磁場変調検出を用いた高感度VNA強磁性共鳴測定装置の開発とその磁化測定への応用. [電気学会論文誌Ａ(基礎・材料・共通部門誌), 141(5), 295-300, 2021] 田丸慎吾, 山本竜也, 大沼智幸, 菊池伸明, 岡本聡  (DOI: 10.1541/ieejfms.141.295)
    2. Intrinsic hard magnetic properties of Sm(Fe,Co)12−xTix compound with ThMn12 structure. [Journal of Alloys and Compounds, 861, 158477; 1-7, 2021] A. Makurenkova, D. Ogawa, P. Tozman, S. Okamoto, S. Nikitin, S. Hirosawa, K. Hono, Y.K. Takahashi  (DOI: 10.1016/j.jallcom.2020.158477)
    3. Experimental approaches for micromagnetic coercivity analysis of advanced permanent magnet materials. [Science and Technology of Advanced Materials, 22(1), 124-134, 2021] S. Okamoto  (DOI: 10.1080/14686996.2021.1874836)
2020
    1. Direct detection and stochastic analysis on thermally activated domain-wall depinning events in micropatterned Nd-Fe-B hot-deformed magnets. [Acta Materialia, 201, 7-13, 2020] T. Yomogita, S. Okamoto, N.. Kiikuchi, O. Kitakami, H. Sepehri-Amin, Y.K. Takahashi, T. Ohkubo, K. Hono, K. Hioki, A. Hattori  (DOI: 10.1016/j.actamat.2020.09.074)
    2. In Situ Study of Molecular Doping of Chlorine on MoS2 Field Effect Transistor Device in Ultrahigh Vacuum Conditions. [ACS Omega, 5(43), 28108-28115, 2020] NT. Trung, MI. Hossain, MI. Alam, A. Ando, O. Kitakami, N. Kikuchi, T. Takaoka, Y. Sainoo, R. Arafune, T. Komeda  (DOI: 10.1021/acsomega.0c03741)
    3. Time-resolved imaging of an operating hard-disk-drive write head using nano-beam x-ray magnetic circular dichroism. [Journal of Applied Physics, 128, 133903; 1-9, 2020] H. Suto, A. Kikitsu, Y. Kotani, T. Maeda, K. Toyoki, H. Osawa, N. Kikuchi, S. Okamoto, T. Nakamura  (DOI: 10.1063/5.0022571)
    4. 永久磁石材料における保磁力解析と磁化反転機構. [粉体および粉末冶金, 67(12), 666-674, 2020] 岡本聡
    5. Broadband and high-sensitivity permeability measurements on a single magnetic particle by transformer coupled permeameter. [Journal of Magnetism and Magnetic Materials, 501, 166434; 1-7, 2020] S. Tamaru, N. Kikuchi, T. Igarashi, S. Okamoto, H. Kubota, S. Yoshida  (DOI: 10.1016/j.jmmm.2020.166434)
    6. Magnetization manipulation induced by nonlocal spin injection from a perpendicular spin polarizer: nano-beam X-ray MCD study using an order-sorting-aperture collection method. [APPLIED PHYSICS EXPRESS, 13(4), 043002, 2020] H. Suto, N. Kikuchi, S. Okamoto, K. Toyoki, Y. Kotani, T. Nakamura  (DOI: 10.35848/1882-0786/ab7bcb10)
    7. Imaging of transient magnetization dynamics of Co/Pt multilayer dots with X-ray magnetic circular dichroism excited by microwaves. [Japanese Journal of Applied Physics, 59, SEED03; 1-7, 2020] N. Kikuchi, T. Yomogita, K. Sato, S. Okamoto, O. Kitakami, H. Osawa, M. Suzuki, K. Toyoki, Y. Kotani and T. Nakamura  (DOI: 10.35848/1347-4065/ab6cb1)

 

その他（Misc）

2023
    1. T字型スピン波分波器を用いたスピン波のモード変換. [電気学会研究会資料, MAG-23-083-086. 088-09, 29-33, 2023] 谷口卓也, J. Sahliger, C. Back
    2. Spin wave mode conversion in an in-plane magnetized microscale T-shaped YIG magnonic splitter. [arXiv, 2308, 14327, 2023] T. Taniguchi, J. Sahliger, C. H. Back
    3. スピン軌道トルクによる磁化反転と交換バイアス反転の経時観測. [電気学会マグネティクス研究会資料,  MAG-23-066-082, 69-74, 2023] 谷口卓也, Y. Wang, P. Lin, D. Zicchino, A. Nickl, J. Sahliger, C. Lai, C. Song, H. Wu, Q. Dai, C. Back
    4. Tb拡散Nd-Fe-B焼結磁石の 3次元微細組織と磁区構造からの特徴抽出. [電気学会マグネティクス研究会資料, MAG-23-066-082, 47-49, 2023] 諏訪智巳, 石上啓介, 岡本聡, 鈴木基寛
    5. マイクロ波アシスト磁化反転と熱揺らぎ. [信学技報, 123(65), 37-42, 2023] 菊池伸明, 佐藤勝成, 水谷聡志, 畑山正寿, 島津武仁, 岡本聡
    6. 時間変調メタマテリアルに向けたスピン流誘起透磁率制御. [信学技報, 123(65), 32-36, 2023] 児玉俊之, 菊池伸明, 岡本聡, 大野誠吾, 冨田知志
    7. 特集「保磁力の学理における最近の進歩」によせて. [日本金属学会誌, 87(5), 149, 2023] 広沢哲, 岡本聡
    8. 永久磁石における磁気ヒステリシスに関わる最近の進展. [日本金属学会誌, 87(5), 150-157, 2023] 岡本聡
2022
    1. 時間変調メタマテリアルに向けた透磁率変調. [電気学会マグネティックス研究会資料集, MAG22146, 2022] 児玉俊之, 黒澤裕之, 大野誠吾, 菊池伸明, 畑山正寿, 岡本 聡, 冨田知志
    2. 放射光X線磁気トモグラフィーによる永久磁石材料内部の3次元磁区構造観察. [日本磁気学会誌「まぐね」, 17, 187-193, 2022] 鈴木基寛, 岡本聡
2021
    1. 初等連載講座 磁性材料と電磁波 第3回 マイクロ波帯での磁化ダイナミクス. [日本磁気学会誌「まぐね」, 16(4), 202-208, 2021] 岡本聡
    2. 極薄化によSm(Fe₈₀CO₂₀)₁₂微粒子薄膜の作製と保磁力発現可能性の検討. [電気学会研究会資料, 2021(82), 37-40, 2021] 芳賀僚太, 菊池伸明, 岡本聡, 高橋有紀子
    3. Co/Pt多層膜ナノドットのマイクロ波アシスト磁化反転における熱活性の影響. [映像情報メディア学会技術報告, 45(14), 7-11, 2021] 水谷聡志, 菊池伸明, 畑山正寿, 岡本聡, 島津武仁
    4. 永久磁石材料の熱活性磁化反転解析. [日本磁気学会誌「まぐね」, 16(1), 38-43, 2021] 岡本聡
2020
    1. 硬X線磁気トモグラフィによる極微細粒Nd-Fe-B焼結磁⽯の三次元磁区観察. [電気学会マグネティクス研究会資料, MAG-20-113, 2020] 竹内誠, 芳賀僚太, 菊池伸明, 岡本聡, 鈴木基寛, 小林慎太郎, 中村哲也, 大久保忠勝, 埋橋淳, 宇根康裕
    2. トランス結合型透磁率測定装置 ~磁性微粒子単体の測定を可能にする超高感度, 超広帯域の透磁率測定装置~. [日本磁気学会誌「まぐね」, 15(2), 134, 2020] 田丸慎吾, 菊池伸明, 五十嵐利行, 岡本聡, 久保田均, 吉田栄吉
    3. マイクロ波アシスト磁化反転. [日本磁気学会誌「まぐね」, 15(2), 89-95, 2020] 菊池伸明, 岡本聡, 北上修, 島津武仁

 

書籍（Books）

      1. Magnetic Measurement Techniques for Materials Characterization. [Springer, 2021] S. Okamoto (担当:共著, 範囲: 22. Permanent Magnet Materials)
      2. RF power semiconductor generator application in heating and energy utilization. [Springer Nature Singapore Pte Ltd, 2020] S. Okamoto (担当:共著, 範囲: Microwave-assisted magnetic recording (MAMR))